<template>
  <view>
    <my-search :bgColor="'#c00000'" @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view scroll-y :style="{height: wh + 'px'}" class="left-scroll-view">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item', index === active ? 'active' : '']" @click="activeChanged(index)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="right-scroll-view" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">
            / {{item2.cat_name}} /
          </view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon" mode=""></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        //当前设备的可用高度
        wh: 0,
        //分类列表数据
        cateList: [],
        active: 0,
        //二级分类数据
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      // console.log(sysInfo);
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const res = await uni.$http.get('/api/public/v1/categories')
        // console.log(res);
        if(res.data.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.data.message
        this.cateLevel2 = res.data.message[0].children
      },
      activeChanged(index) {
        this.active = index
        // 为二级分类列表重新赋值
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item3) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
    .left-scroll-view {
      width: 120px;
      .left-scroll-view-item {
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        
        &.active {
          background-color: #FFFFFF;
          position: relative;
          
          &::before {
            content: "";
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
  
  .cate-lv2-title {
   font-size: 12px; 
   font-weight: bold;
   text-align: center;
   padding: 15px 0;
  }
  
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
    }
  }
</style>
